Which of the following pigments does NOT absorb yellow/orange light (650-750nm)?

• A. Chlorophyll a.
• B. Carotenoids.
• C. Chlorophyll b.
• D. Both a and c.

Answer: (B)

Verified step by step guidance

1. Understand the role of pigments in photosynthesis: Pigments are molecules that absorb specific wavelengths of light and are crucial for capturing light energy during photosynthesis.
2. Identify the absorption spectrum of each pigment: Chlorophyll a and chlorophyll b primarily absorb light in the blue (around 430-450 nm) and red (around 640-680 nm) regions of the spectrum.
3. Recognize the absorption characteristics of carotenoids: Carotenoids absorb light in the blue-green region (around 400-500 nm) but do not absorb light in the yellow/orange region (650-750 nm).
4. Compare the absorption spectra: Since carotenoids do not absorb yellow/orange light, they are the pigments that do not absorb light in the 650-750 nm range.
5. Conclude which pigment does not absorb yellow/orange light: Based on the absorption spectra, carotenoids are the pigments that do not absorb light in the yellow/orange range.